Multi-stage vibration damper with hysteresis adjustment means

Abstract

Disclosed is a multi-stage damping device with a mechanical stopper. The invention discloses a vibration damping device, comprising: a first damping unit provided with a first input member, a first output member, and a first spring; a second damping unit provided with a second input member, a second output member, and a second spring, the second damping unit being disposed on the outside of the first damping unit in the axial direction; a rotor unit including a rotor sleeve; and a mechanical stopper for limiting the relative rotation between the first input member and the first output member or the second input member beyond a predetermined range.

Description

Technical Field

[0001] The present invention relates to a vibration damping device for a vehicle, in particular a hybrid vehicle, and more particularly to a multi-stage vibration damping device with a hysteresis adjustment means. Background Art

[0002] One known hybrid vehicle powertrain configuration incorporates an electric motor within the transmission, with a vibration damper positioned radially inward. A torsional vibration damper, also known as a torsional vibration damper, can be constructed by connecting two or more dampers in series to improve the absorption of engine vibrations. The damper can be located within the transmission and lubricated with transmission oil.

[0003] Korean registered patent No. 10-2238845 "Power transmission device for hybrid vehicle", such as Figure 1 As shown in FIG. 1 , the power transmission device 1 arranged between the engine 2 on the right side and the transmission 3 on the left side includes a torsional damper 40 having two damping parts 41 and 42. Figure 1 As can be seen from the enlarged view below, a rotor sleeve P11 is coupled to the rotor P10 arranged on the engine 2 side, while a driven plate P40 is arranged on the transmission 3 side.

[0004] The first torsional damper 42 includes a cover plate P20 and a spring P21, with a driven plate P23 positioned within it. The cover plate P20 of the first torsional damper 42 is welded to a connection portion P25 on the rotor sleeve P11. The second torsional damper 41 includes a front cover plate P30 and a spring P31. Hysteresis adjustment members P35a and P35b, such as friction washers or elastic washers, are arranged on either side of the driven plate P40 within the second torsional damper. Hysteresis refers to the elastic hysteresis phenomenon.

[0005] In the aforementioned torsional damper structure, particularly during idle operation, the components forming the first and / or second torsional dampers move axially or radially, often causing so-called idle noise or rattle. To suppress this idle noise, a hysteresis adjustment component P35 is provided.

[0006] In the above-mentioned prior art, the hysteresis adjustment member P35 is provided only on the second torsional damper 41 side, and therefore it is difficult to effectively suppress the idling noise generated by the first torsional damper 42 .

[0007] In order to reliably suppress the idling noise of the vibration damping device, a hysteresis adjustment member must be arranged at a necessary position. However, since other components of the vibration damping device for a hybrid vehicle are already densely arranged in a limited space, it is quite difficult to additionally provide a hysteresis adjustment member therein.

[0008] Furthermore, the connection portion P25 between the cover plate P20 of the first torsional damper 42 and the rotor sleeve P11 is located radially inward of the center of the torsional damper 40, that is, radially inward of the spring P21 biasing the first torsional damper. During rotation, the components of the torsional damper 40 tend to deflect radially outward due to centrifugal force. However, the radially inward connection portion P25 cannot reliably suppress this deflection, and therefore cannot effectively suppress the idling noise of the entire torsional damper 40. Summary of the Invention

[0009] An object of the present invention is to provide a multi-stage vibration damping device which can eliminate the axial and radial movement of the damper and the abnormal spring behavior caused thereby.

[0010] Another object of the present invention is to provide a multi-stage vibration damping device that can prevent spring damage caused by abnormal engine torque.

[0011] Furthermore, another object of the present invention is to provide a multi-stage vibration reduction device that can prevent axial / radial movement of the damper and / or damage to the spring while maintaining the structural compactness of the existing damper.

[0012] The technical problems to be solved by the present invention are not limited to the problems mentioned above. Other problems not mentioned above can be clearly understood by those skilled in the art through the following description.

[0013] To achieve the above-mentioned objectives, the vibration damping device according to the present invention includes the following means and any combination thereof.

[0014] One embodiment of the present invention is a vibration reduction device, which includes: a first damping unit, including a first input member, a first output member and a first spring; a second damping unit, including a second input member, a second output member and a second spring, and arranged axially outside the first damping unit; a rotor unit, including a rotor sleeve; and a mechanical limiter for limiting relative rotation between the first input member and the first output member or the second input member beyond a predetermined range.

[0015] Another embodiment of the present invention is a vibration damping device, wherein the first input member has a center hole; the mechanical limiter includes: a first protrusion protruding radially inward from the first input member toward its center hole; and a second protrusion protruding axially inward from the second input member toward the first input member, when the first input member or the second input member rotates, the first protrusion and the second protrusion interfere with each other.

[0016] Another embodiment of the present invention is a vibration damping device, wherein the mechanical limiter includes a first protrusion protruding axially inward from the first input member toward the first output member, and when the first input member or the first output member rotates, the first protrusion interferes with the first output member.

[0017] Another aspect of the present invention is a vibration damping device further including a hysteresis adjusting means arranged axially rearward of the first output member, wherein the hysteresis adjusting means has a circumferential groove for avoiding interference with the second protrusion.

[0018] Another aspect of the present invention is a vibration damping device further including a hysteresis adjustment means arranged axially forward and / or rearward of the first output member.

[0019] Another aspect of the present invention is a vibration damping device, wherein at least one of the hysteresis adjustment means has a groove into which the first protrusion can be inserted.

[0020] Another aspect of the present invention is a vibration damping device, wherein a second protrusion protruding axially is formed in front of and / or behind the first output member, and at least one of the hysteresis adjustment means has a groove into which the second protrusion is inserted.

[0021] Another aspect of the present invention is a vibration damping device, wherein the first input member is a cover plate, and the second input member is a front cover plate.

[0022] Another aspect of the present invention is a vibration damping device, wherein the first output member and the second output member are driven plates.

[0023] Another aspect of the present invention is a vibration damping device, wherein the first output member and the second input member are coupled to each other so as to be fixed in a rotational direction.

[0024] Another aspect of the present invention is a vibration damper device, wherein the first input member is located radially outside the first spring and is connected to the rotor sleeve.

[0025] Another embodiment of the present invention is a vibration damping device, wherein the first spring includes an outer spring and an inner spring inserted into the inner portion of the outer spring, and the first input member is radially located outside either the outer spring or the inner spring of the first spring and is connected to the rotor sleeve.

[0026] Another aspect of the present invention is a vibration damper device, wherein the first input member is located radially outside a center of the first spring and is connected to the rotor sleeve.

[0027] Another aspect of the present invention is a vibration damping device further including a hysteresis adjustment means arranged axially forward and / or rearward of the first output member.

[0028] Another aspect of the present invention is a vibration damping device further including a hysteresis adjustment means arranged axially forward and / or rearward of the second output member.

[0029] Another embodiment of the present invention is a vibration damping device, wherein the hysteresis adjustment means includes at least one of a friction washer, a metal washer, and an elastic washer.

[0030] Effects of the Invention

[0031] According to the present invention, the idling noise of the multi-stage vibration damping device can be suppressed more effectively while maintaining a compact design.

[0032] According to the present invention, it is possible to prevent spring damage due to abnormal engine operation while maintaining a compact design.

[0033] The effects of the present invention are not limited to the effects listed above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following description, taken in conjunction with the accompanying drawings, will provide a better understanding of the present invention. Components designated by the same reference numerals in different figures have similar functions and, therefore, will not be repeated unless necessary to facilitate understanding of the present invention. Known components are briefly described or omitted, but this should not be construed as excluding them from the embodiments of the present invention.

[0035] Figure 1 1 is a diagram schematically showing a hybrid vehicle power transmission device including a vibration damping device according to a conventional technique of the present invention;

[0036] Figure 2 is a perspective view of a vibration reduction device according to an embodiment of the present invention;

[0037] Figure 3 is a rear view of a vibration reduction device according to an embodiment of the present invention;

[0038] Figure 4 is a perspective view of a cover plate according to an embodiment of the present invention;

[0039] Figure 5 is a perspective view of a front cover according to an embodiment of the present invention;

[0040] Figure 6 yes Figure 4 The cover and Figure 5 A schematic diagram of a front cover in a folded state;

[0041] Figure 7 is a perspective view of a driven plate according to one embodiment of the present invention;

[0042] Figure 8 is a perspective view of another driven plate according to an embodiment of the present invention;

[0043] Figure 9 is a perspective view of a friction washer and a metal washer according to an embodiment of the present invention;

[0044] Figure 10 is a perspective view of an elastic washer according to an embodiment of the present invention;

[0045] Figure 11a is a perspective view of another friction washer according to an embodiment of the present invention;

[0046] Figure 11b yes Figure 11a a cutaway perspective view of the friction washer shown;

[0047] Figure 12 is a perspective view of another friction washer according to an embodiment of the present invention;

[0048] Figure 13 is a half-sectional view of a vibration damping device according to an embodiment of the present invention;

[0049] Figure 14 yes Figure 13 Partially enlarged stereogram;

[0050] Figure 15 is a conceptual diagram showing an arrangement of a spring, a hysteresis adjustment means, and a mechanical stopper according to the present invention;

[0051] Figure 16a is a diagram schematically showing an arrangement of a spring, a hysteresis adjustment means, and a mechanical limiter according to an embodiment of the present invention;

[0052] Figure 16b is a diagram schematically showing an arrangement of a spring, a hysteresis adjustment means, and a mechanical limiter according to another embodiment of the present invention;

[0053] Figure 17 It is a diagram schematically showing the arrangement of a spring, a hysteresis adjustment means, and a mechanical stopper according to another embodiment of the present invention. DETAILED DESCRIPTION

[0054] The present invention is not limited to the embodiments disclosed below and is subject to various modifications and may be implemented in different forms. However, these embodiments are provided to complete the disclosure of the present invention and to fully convey the scope of the invention to those with ordinary knowledge. Therefore, it should be understood that the present invention is not limited to the embodiments disclosed below and includes not only replacing or adding features of one embodiment with features of other embodiments, but also all modifications, equivalents, and even substitutes included in the technical concept and scope of the present invention.

[0055] It should be understood that the drawings are intended only to facilitate understanding of the embodiments disclosed in this specification. The technical concepts disclosed in this specification are not limited to the drawings and include all modifications, equivalents, and even substitutes within the concept and technical scope of the present invention. In the drawings, the size or thickness of components may be exaggerated or reduced for ease of understanding, but this shall not limit the scope of protection of the present invention.

[0056] The terms used in this specification are only used to describe specific implementation examples or embodiments and are not intended to limit the present invention. Unless the context clearly indicates otherwise, singular expressions include plural expressions. In the specification, terms such as "including" and "consisting of" are intended to indicate the presence of features, numbers, steps, operations, constituent elements, parts or combinations thereof described in the specification. That is, in the specification, terms such as "including" and "consisting of" should be understood as not excluding in advance the presence or additional possibility of one or more other features, numbers, steps, operations, constituent elements, parts or combinations thereof.

[0057] Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another.

[0058] When a component is referred to as being “connected” or “coupled” to another component, it should be understood that it can be directly connected or coupled to the other component, but other components may exist in between. Conversely, when a component is referred to as being “directly connected” or “directly coupled” to another component, it should be understood that no other components exist in between.

[0059] When it is mentioned that a certain component is “located above” or “below” another component, it should be understood that it not only includes being arranged directly above the other component, but also includes that there may be other components in between.

[0060] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meanings as those commonly understood by persons of ordinary skill in the art to which this invention belongs. Terms that are the same as those defined in commonly used dictionaries should be interpreted as having the same meanings in the context of the relevant art and should not be interpreted as ideal or overly formalized meanings unless explicitly defined in this application.

[0061] Because the components of the embodiment are symmetrical about an axis, only half is shown with the axis as the reference for ease of drawing. Furthermore, for ease of explanation, the lengthwise direction of the axis along the component's center of rotation is referred to as the axial direction. That is, the front-to-back direction, or axial direction, is a direction parallel to the axis of rotation, with the front (front side) pointing in one direction toward the power source, such as toward the vehicle's drive motor, and the rear (rear side) pointing in another direction, such as toward the transmission. Therefore, the front (front side) refers to the side with its surface facing forward, and the rear (rear side) refers to the side with its surface facing rearward.

[0062] A radial direction or radial direction refers to a direction approaching or departing from the center of the rotation axis along a straight line passing through the center of the rotation axis in a plane perpendicular to the rotation axis. Directions radially away from the center are called centrifugal directions, while directions approaching the center are called centripetal directions.

[0063] The circumferential or circumferential direction refers to the direction around the axis of rotation. The outer circumference refers to the outside circumference, and the inner circumference refers to the inside circumference. Thus, the outer peripheral surface refers to the side facing away from the axis of rotation, and the inner peripheral surface refers to the side facing the axis of rotation. The circumferential side surface refers to the side whose normal faces the circumferential direction.

[0064] In the present invention, the axially inner side refers to a position closer to the engine in the axial direction, and the axially outer side refers to a position farther from the engine in the axial direction.

[0065] The present invention will be described in detail below with reference to the accompanying drawings.

[0066] First refer to Figure 2 According to one embodiment of the present invention, a vibration damping device 1 is shown, including a rotor shaft 10, a rotor sleeve 11, cover plates 20 and 40, etc. In the present invention, a vibration damping device may also be referred to as a rotor and damper assembly. A "multi-stage" vibration damping device refers to a device comprising two or more dampers connected in series. The illustrated embodiment exemplifies a vibration damping device comprising two dampers. Hereinafter, the damper located axially inward is referred to as the first damper, and the damper located axially outward is referred to as the second damper.

[0067] The vibration damping device according to the present invention is preferably used for installation in a transmission of a hybrid vehicle, at a position radially inside the electric motor.

[0068] from Figure 2 The back view of Figure 3 It can be seen that the connection portion 15 between the rotor sleeve 11 and the cover plate 20, such as a welded portion, is shown. The rear cover plate 60 has a connection hole 61 and a washer hole 62. The rivet 18 is inserted into the connection hole 61 to achieve the connection between the rear cover plate 60 and the front cover plate 40 (see Figure 13 ). An outer spring 65a and an inner spring 65b are housed inside the rear cover 60. The four sets of springs 65a and 65b are arranged in the circumferential direction. The driven plate 50 is arranged in the second damper. The rivet 17 connects the driven plate 30 arranged in the first damper to the front cover 40 of the second damper (see Figure 13 ). By the rivet connection, the two components are not only fixed in the axial direction, but also in the rotational direction, so they always rotate together.

[0069] Figure 4 The cover plate 20 is shown in FIG. It, along with the driven plate 30 and springs 37a and 37b (described later), constitutes the first damper and functions as the input member of the first damper. Specifically, it is connected to the rotor sleeve to transmit the driving force from the engine.

[0070] The cover plate 20 is annular in shape and has a center hole 21 for inserting the rotor shaft 10, a spring receiving space 22, and a washer hole 24. The locking protrusion 74 of the friction washer 73 described later is inserted into the washer hole 24 (see Figure 11a ).

[0071] The cover plate 20 may have a key 23 protruding toward one side, ie, radially inward, of the central hole 21. In this example, there are four radial keys 23 in total.

[0072] Figure 5 The front cover plate 40 is shown in FIG. It, along with the driven plate 50, rear cover plate 60, and springs 65a and 65b (described later), constitutes a second damper and functions as the input member of the second damper. Specifically, it is coupled to the driven plate 30, which serves as the output member of the first damper, to transmit driving force.

[0073] The front cover plate 40 has a center hole 41 for inserting the rotor shaft 10, etc., a spring accommodation space 42, a coupling hole 44, and an oil flow hole 45. The coupling hole 44 is formed inside the center hole 41 and is used for riveting to the driven plate 30 (described later). The oil flow hole 45 is formed radially outside the coupling hole 44 and is used to flow lubricating oil, such as transmission fluid (ATF).

[0074] The front cover plate 40 may have axially protruding keys 43. In this example, there are four axial keys 43 in total.

[0075] Figure 6 Shown is Figure 4 The cover plate 20 is shown with Figure 5 The front cover plate 40 is shown in a collapsed state, i.e., in its fully assembled configuration. The two components are capable of relative rotation. As the figure clearly illustrates, when either component rotates, the radial key 23 and the axial key 43 may interfere with each other. This interference is known as "interference."

[0076] The first damper's input member, the cover plate 20, transmits power to the driven plate 30 and its coupled front cover plate 40 via springs 37a and 37b. When the engine generates excessive torque, the springs 37a and 37b could become overly compressed and break. The interference structure between the radial key 23 and the axial key 43 limits relative rotation between the cover plate 20 and the front cover plate 40 to a certain range. In other words, over-rotation of the input member, the cover plate 20, is prevented, thereby preventing excessive compression of the springs 37a and 37b.

[0077] Figure 7 The driven plate 30 of the first damper according to one embodiment of the present invention is shown. The driven plate 30 includes a central hole 31 formed in its center, coupling holes 32 for inserting coupling members such as rivets, and oil flow holes 33 for the flow of lubricating oil, such as automatic transmission fluid (ATF). The series of holes formed near the center of the driven plate 30 serve as coupling holes 32, while the series of holes formed farther away serve as oil flow holes 33. The central hole 31 is for inserting the rotor shaft 10 and other components. The blades 35 of the driven plate 30 receive power via a spring and function as the output member of the first damper.

[0078] Figure 8 The figure shows a driven plate 50 serving as the output member of the second damper according to one embodiment of the present invention. The driven plate 50 has a central hole 51 formed with a spline portion 55 and a through-hole 52. When the second damper is assembled, the through-hole 52 allows the rivet 17 to pass through, thereby riveting the driven plate 30 to the front cover plate 40. The driven plate 50 also has a blade 54.

[0079] Figure 9 and Figure 10 The figure shows a hysteresis adjustment member according to an embodiment of the present invention, namely a friction washer 70, a metal washer 76 and an elastic washer 77. The friction washer 70 is provided with an oil flow groove 71.

[0080] Figure 11a and Figure 11b Another friction washer 73 according to an embodiment of the present invention is shown. The friction washer 73 has a locking protrusion 74 that can be inserted into the washer hole 24 on the cover plate 74. In order to avoid interference with the axial key 43, the friction washer 73 can have a circumferential groove. Therefore, its upper side profile 75 can have a " "shape.

[0081] Figure 12 Another friction washer 78 according to an embodiment of the present invention is shown. The friction washer 78 has a latching protrusion 79 that can be inserted into the washer hole 62 on the rear cover plate 60.

[0082] Figure 13 A half-section view of a vibration damping device according to an embodiment of the present invention. Figure 13 The left side is the engine side, and the right side is the transmission side. The rotor consists of a rotor shaft 10 and a rotor sleeve 11. Arranged on the right side is the first damper, consisting of a driven plate 30, outer spring 37a, inner spring 37b, and a cover plate 20. Springs 37a and 37b can be arranged in four sets along the circumference. Also arranged on the right side is the second damper, consisting of a front cover plate 40, outer spring 65a, inner spring 65b, driven plate 50, and rear cover plate 60. The driven plate 30 and front cover plate 40 are connected by rivets 17. Furthermore, a bushing 13 is provided on the sliding surface of the rotor shaft 10.

[0083] A coupling portion 16 is provided between the rotor shaft 10 and the rotor sleeve 11, and a connecting portion 15 is provided between the rotor sleeve 11 and the cover plate 20. The connecting portions 15 and 16 may be welded portions.

[0084] On the left side, i.e., the front side, of the driven plate 30 are arranged a friction washer 70, a metal washer 76, and an elastic washer 77. Since the friction washer 70 is pushed toward the inner wall of the rotor sleeve 11 by the elastic washer 77, it can rotate along with the rotor sleeve 11 when the rotor sleeve 11 rotates.

[0085] A friction washer 73 is arranged on the right side, that is, the rear side, of the driven plate 30. The friction washer 73 is rotatable together with the cover plate 20 because the locking protrusion 74 is inserted into the cover plate 20.

[0086] Likewise, a friction washer 78 is arranged on the right side, ie, the rear side, of the driven plate 50 , and is engaged with the rear cover plate 60 via a locking protrusion 79 , so that the friction washer 78 can rotate together with the rear cover plate 60 .

[0087] As described above, in the vibration damping device according to the present invention, hysteresis adjustment means is provided not only on the second damper side but also on the first damper side, thereby suppressing axial movement of the components constituting the first damper.

[0088] Providing the connecting portion 15 radially outwardly helps to firmly suppress radial deflection of the vibration damping device, thereby facilitating hysteresis control, specifically, idling noise suppression. Forming the connecting portion 15 radially outwardly of the components that comprise the vibration damping device achieves the aforementioned effect of stably counteracting component deflection caused by centrifugal force. Specifically, the connecting portion 15 is preferably provided radially outwardly of the springs 37a and 37b of the first damper.

[0089] Furthermore, if the connecting portion 15 is also arranged outside the springs 37a and 37b of the first damper in the axial direction, that is, between the first damper and the second damper, it is more conducive to hysteresis adjustment.

[0090] The spring of the first damper may have a double spring structure consisting of an outer spring 37a and an inner spring 37b inserted therein. The center 38 of the spring is the same with respect to the outer spring 37a and the inner spring 37b.

[0091] When the engine drives the rotor, the cover plate 20 fixed to the rotor sleeve 11 rotates, providing initial vibration damping via the springs 37a and 37b of the first damper. When the vibration amplitude exceeds the elastic force of the first damper, the driven plate 30 rotates, and the front cover plate 40 of the second damper fixed to the driven plate 30 also rotates, causing the springs 65a and 65b of the second damper to provide secondary damping.

[0092] Figure 14 It can be seen that the friction washer 73 arranged on the right side of the driven plate 30 is formed into a cross section 75 to avoid interference with the axial key 43. "shape.

[0093] As described above, the inventors of the present invention have discovered that by arranging the joint between the vibration reduction unit having multiple torsional dampers and the rotor sleeve radially or axially outside the spring of the first damper, and arranging a hysteresis adjustment member in front of and / or behind the output member of the first torsional damper, idling noise can be effectively suppressed.

[0094] Figures 15 to 17 The arrangement of the spring, the hysteresis adjustment means and the mechanical limiter according to an embodiment of the present invention is schematically shown.

[0095] Figure 15 (a) means Figure 13 The arrangement of the spring, hysteresis member and mechanical limiter in the embodiment shown is shown. Figure 13 The dotted circles and boxes correspond to each other. Figure 15 As shown in (b), if the above three components are arranged in a row along the radial direction, a more compact axial structure can be obtained, and the axial space obtained thereby can improve the degree of freedom in design.

[0096] like Figure 16a and 16b As shown, instead of the key 43 previously extending axially from the front cover of the second damper, a key ("mechanical stopper") protruding axially inward from the "cover plate" of the first damper is provided. This "mechanical stopper" interferes with (the blade of) the "driven plate," thereby preventing the cover plate of the first damper from excessively rotating, thereby preventing excessive compression of the spring.

[0097] The "friction washers" on the left and right sides of the "driven plate" have keyways for inserting "mechanical limiters" and are coupled with the "mechanical limiters". , thus achieving synchronous rotation. The "elastic washer" can be placed axially outside the right "friction washer" ( Figure 16a ) or axially inside ( Figure 16b ). Thus, the spring, the hysteresis member and the mechanical limiter can be arranged in a row along the radial direction.

[0098] Figure 17 and Figure 16a and 16b Similarly, a mechanical stopper protruding axially inward from the cover plate of the first damper is shown. However, the friction washers on either side have keyways that mate with the keys protruding from the follower plate, allowing the friction washers and follower plate to rotate synchronously. The elastic washer is positioned radially inward of the right friction washer. This structure also features a spring, hysteresis element, and mechanical stopper arranged radially in a row.

[0099] Regarding this point, the above Figure 6 and Figure 13 The embodiment shown is a structure in which the input member of the second damper (ie, the front cover 40) prevents the input member of the first damper (ie, the cover 20) from over-rotating. Figure 16a 、 16b and Figure 17 The illustrated embodiment employs a structure in which the output member of the first damper (i.e., driven plate 30) interferes with the rotation of the input member of the first damper. As previously mentioned, the input member of the second damper is coupled to and rotates integrally with the output member of the first damper. Therefore, the same result is achieved whether either member interferes with the rotation of the input member of the first damper.

[0100] In summary, the inventors of the present invention have proposed a method for achieving a more compact vibration damping device by optimizing the arrangement of a spring, a limiter, and a hysteresis member.

[0101] Although the embodiments of the present invention have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that the present invention may be implemented in other specific forms without departing from the technical concepts or essential features of the present invention. Therefore, the above embodiments are merely illustrative and non-limiting. The scope of the present invention should be interpreted as defined by the claims, and all technical concepts within the scope equivalent to the claims are within the scope of the present invention.

Claims

1. A vibration damping device, wherein: include: A first damping unit includes a first input member, a first output member, and a first spring; a second damping unit comprising a second input member, a second output member and a second spring, and arranged axially outside the first damping unit; a rotor unit comprising a rotor sleeve; and A mechanical limiter is used to limit the relative rotation between the first input member and the first output member or the second input member from exceeding a predetermined range.

2. The vibration damping device according to claim 1, wherein: The first input member has a central hole; The mechanical limiter comprises: a first protrusion protruding from the first input member toward the radially inner side of a central hole thereof; and a second protrusion protruding from the second input member toward the axially inner side of the first input member, When the first input member or the second input member rotates, the first protrusion and the second protrusion interfere with each other.

3. The vibration damping device according to claim 1, wherein: The mechanical stopper includes a first protrusion protruding axially inward from the first input member toward the first output member. When the first input member or the first output member rotates, the first protrusion and the first output member interfere with each other.

4. The vibration damping device according to claim 2, wherein: The system further comprises a hysteresis adjustment means arranged axially rearward of the first output member, The hysteresis adjusting means has a circumferential groove for avoiding interference with the second protrusion.

5. The vibration damping device according to claim 3, wherein: The invention further comprises a hysteresis adjustment means arranged axially in front of and / or behind the first output member.

6. The vibration damping device according to claim 5, wherein: At least one of the hysteresis adjustment means has a groove into which the first protrusion can be inserted.

7. The vibration damping device according to claim 5, wherein: A second protrusion that protrudes axially is formed in front of and / or behind the first output member, and at least one of the hysteresis adjustment means has a groove into which the second protrusion can be inserted.

8. The vibration damping device according to claim 1, wherein: The first input component is a cover plate, and the second input component is a front cover plate.

9. The vibration damping device according to claim 1, wherein: The first output member and the second output member are driven plates respectively.

10. The vibration damping device according to claim 1, wherein: The first output member and the second input member are coupled to each other in a rotationally fixed manner.

11. The vibration damping device according to claim 1, wherein: The first input member is located radially outward of the first spring and is connected to the rotor sleeve.

12. The vibration damping device according to claim 1, wherein: The first spring includes an outer spring and an inner spring inserted into the outer spring. The first input member is located radially outside of either the outer spring or the inner spring of the first spring and is connected to the rotor sleeve.

13. The vibration damping device according to claim 1, wherein: The first input member is located radially outside a center of the first spring and is connected to the rotor sleeve.

14. The vibration damping device according to claim 1, wherein: The invention further comprises a hysteresis adjustment means arranged axially in front of and / or behind the first output member.

15. The vibration damping device according to claim 14, wherein: The invention further comprises a hysteresis adjustment means arranged axially forward and / or rearward of the second output member.

16. The vibration damping device according to claim 14 or 15, wherein: The hysteresis adjustment means includes at least one of a friction washer, a metal washer and an elastic washer.

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